Top Tweets for #M68K
M68000PRM.pdf p.2-17 Program Counter Memory Indirect Preindexed Mode #m68k
PCメモリ間接も同様。
EA = (bd + PC + Xn.SIZE*SCALE) + od
M68000PRM.pdf p.2-12 Memory Indirect Preindexed Mode #m68k
GENERATIONがポストインデックスと同じになっています。正しくは
EA = (bd + An + Xn.SIZE*SCALE) + od
(bdとAnの順序が統一されていないのも気になりますが……)
* メモリ間接なし(インデックスあり)
* メモリ間接なし(インデックスなし)
* メモリ間接(プリインデックス)
* メモリ間接(ポストインデックス)
* メモリ間接(インデックスなし)
の5種類あり2ビットで表現できないのを詰め込んだ形。 #m68k
IS-I/ISの表を見ると割り当てにむず痒さを感じてしまうので、実効アドレスの凡例を追加してみました。 #m68k
テキストで欲しかったので #m68k
É hoje! O microprocessador Motorola 68000 de 1979.
+em https://t.co/87AMcEPoUj
#MuseuCapixaba #mcc #éhoje #museu #Motorola #m68000 #m68k #ApolloComputer #AtariST #Capcom #Amiga #HP #LISA #Macintosh #MOS6502 #NeoGeo #Megadrive #X68000 #SiliconGraphicsInc #SNK #SunMicrosystems
gcc-13.4.0とgcc-16.1.0の比較 #m68k
Since we had so much fun gathering all those experts optimizing a piece of assembly code, here is the result. Spoiler alert: we made it >30% faster. #m68k
Motorola 68000 assembly. This is the interrupt service routine that pushes samples to the YM-2149 soundchip 6250 times per second. Every cycle counts. Any optimizations left?
MicroPython 1.28.0 for AmigaOS adds practical scripting tools https://t.co/SgQhiXUYdx #MicroPython #AmigaOS #ClassicAmiga #Python #m68k
See the World in a Grain of Sand.
Motorola 68000 die shot by Pauli Rautakorpi. #m68k
Comanche-style #VoxelSpace renderer on an #AtariST. This time, the focus is on altitude control. I gave up on WASD: Turns out doing proper keyboard control is really hard on the ST. Using the joystick instead which is much easier. How was the #Amiga in that respect? #m68k
#VoxelSpace taken to the extreme. Those pixels are drawn not by writing bytes into a framebuffer, but by changing the background color at exactly the right time, chasing the electron beam. That’s black-belt #m68k sorcery.
Here's the Atari ST demo we've released at Sommarhack with SMFX.
Includes some crazy technical achievements from Tom and Spkr as the demo had to run without writing any data to the screen memory.
#demoscene #atari
https://t.co/1l1777mjB7
Comanche-style #VoxelSpace demo running on 80s home computer, now featuring a dynamically lit interior. Cockpit artwork kindly provided by my nephew Emanuel, modeled and rendered in #Blender3D. #16bit #m68k #AtariST #retroprogramming #demoscene
Getting #Dune vibes on the #AtariST. How about an Ornithopter simulator on 16-bit hardware? Now if there only were Sandworms... #VoxelSpace #m68k
I'm inexplicably getting a lot of joy out of the most irrelevant programming tasks, like finding the optimal code for this bit-fiddling job. This is the best I came up with so far. Any tricks up your sleeves, #m68k assembly pros? #retroprogramming
Optimization is getting increasingly difficult, but this means I'm closing in on the limits of the #m68k processor. Making sure that all active variables fit into the registers was important, and fitting two fixed-point 16b values into one 32b register helped. Also, bit-shifting
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